<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>

		<script>
			window.onload = function() {
				setInterval(function() {
					var r = Math.floor(Math.random() * 256);
					var g = Math.floor(Math.random() * 256);
					var b = Math.floor(Math.random() * 256);
					// rgb(255,0,0)
					document.body.style.backgroundColor = "rgb(" + r + "," + g + "," + b + ")"
				}, 1000)
			}
		</script>
	</body>
</html>